Listen to that laughter! They______themselves.A、must enjoyB、must be enjoyingC、

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问题 Listen to that laughter! They______themselves.

选项 A、must enjoy
B、must be enjoying
C、may be enjoying
D、can be enjoying

答案 B

解析 must be doing sth．用于推断现在必定正在发生的事情。

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TheschoolboardlistenedquietlyasJohnreadthedemandsthathisfollowers___